From e5f9a9912b053c49ab1fb4ba5f1ae9d419bad85f Mon Sep 17 00:00:00 2001
From: Scott Sanderson <ssanderson@badgeinc.com>
Date: Thu, 3 Sep 2020 10:36:20 -0400
Subject: [PATCH] BUG: Fix debug assertion on ShakeCurve animation.

Flutter's Curve class requires that the `transform` function map 0 to ~0 and 1
to ~1. The previous ShakeCurve transform function sin(t * 3 * pi).abs(), which
doesn't satisfy this property because sin(3 * pi) is 0, not 1.

Changing the constant from 3 to 2.5 produces the required endpoint value for t
= 1.
---
 lib/shake_curve.dart | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/shake_curve.dart b/lib/shake_curve.dart
index 535f773..020fd5d 100644
--- a/lib/shake_curve.dart
+++ b/lib/shake_curve.dart
@@ -7,6 +7,6 @@ class ShakeCurve extends Curve {
   @override
   double transform(double t) {
     //t from 0.0 to 1.0
-    return sin(t * 3 * pi).abs();
+    return sin(t * 2.5 * pi).abs();
   }
 }